CN115209584A - Backlight brightness control method, remote controller, air conditioning system and storage medium - Google Patents

Backlight brightness control method, remote controller, air conditioning system and storage medium Download PDF

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Publication number
CN115209584A
CN115209584A CN202110387782.9A CN202110387782A CN115209584A CN 115209584 A CN115209584 A CN 115209584A CN 202110387782 A CN202110387782 A CN 202110387782A CN 115209584 A CN115209584 A CN 115209584A
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China
Prior art keywords
output voltage
voltage
duty ratio
pulse width
width modulation
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CN202110387782.9A
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Chinese (zh)
Inventor
杨宇
谭华泉
刘高扬
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GD Midea Air Conditioning Equipment Co Ltd
Foshan Shunde Midea Electric Science and Technology Co Ltd
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GD Midea Air Conditioning Equipment Co Ltd
Foshan Shunde Midea Electric Science and Technology Co Ltd
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Priority to CN202110387782.9A priority Critical patent/CN115209584A/en
Publication of CN115209584A publication Critical patent/CN115209584A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/56—Remote control
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/38—Switched mode power supply [SMPS] using boost topology
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/165—Controlling the light source following a pre-assigned programmed sequence; Logic control [LC]

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  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The invention provides a backlight brightness control method, a remote controller, an air conditioning system and a computer readable storage medium, wherein the control method is applied to the remote controller in the air conditioning system, the remote controller comprises a battery power supply, a backlight light-emitting element and a booster circuit, the booster circuit is used for receiving a pulse width modulation signal and converting the output voltage of the battery power supply into the driving voltage supplied to the backlight light-emitting element according to the pulse width modulation signal; the control method comprises the following steps: acquiring an output voltage; and controlling the duty ratio of the pulse width modulation signal according to the output voltage and a preset voltage threshold value, so that the booster circuit converts the output voltage into a driving voltage which enables the backlight brightness of the backlight light-emitting element to be kept constant according to the duty ratio of the pulse width modulation signal. In the embodiment of the invention, the duty ratio of the pulse width modulation signal is controlled by using the remote controller, so that the constant brightness of the backlight lamp of the remote controller can be maintained, and the use experience of a user is improved.

Description

Backlight brightness control method, remote controller, air conditioning system and storage medium
Technical Field
The embodiment of the invention relates to the technical field of circuits, in particular to a backlight brightness control method, a remote controller, an air conditioning system and a computer readable storage medium.
Background
The remote controller in the past is not configured with backlight light, for the user, use under the darker circumstances too convenient or even unable to use, therefore, in order to further promote user's use experience, many remote controllers on the market at present all configure backlight light, adopt battery power supply to supply power for the remote controller when using the remote controller of taking backlight light, because the load that can make battery power supply changes at the in-process of using the remote controller, consequently can influence the voltage of supplying with backlight drive module, lead to the luminance of backlight light can't remain stable, bring not good visual flicker sense for the user easily, seriously perhaps cause backlight light drive failure even.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
The embodiment of the invention provides a backlight brightness control method, a remote controller, an air conditioning system and a computer readable storage medium, which can maintain the constant brightness of backlight light of the remote controller, thereby improving the use experience of a user.
In a first aspect, an embodiment of the present invention provides a backlight brightness control method, which is applied to a remote controller in an air conditioning system, where the remote controller includes a battery power supply, a voltage boost circuit, and a backlight light-emitting element; the boosting circuit is used for receiving a pulse width modulation signal and converting the output voltage of the battery power supply into a driving voltage supplied to the backlight light-emitting element according to the pulse width modulation signal;
the backlight brightness control method comprises the following steps:
acquiring the output voltage;
and controlling the duty ratio of the pulse width modulation signal according to the output voltage and a preset voltage threshold value, so that the boosting circuit converts the output voltage into a driving voltage which enables the backlight brightness of the backlight light-emitting element to be kept constant according to the duty ratio of the pulse width modulation signal.
In the backlight brightness control method according to the embodiment of the present invention, when the remote controller obtains the output voltage of the battery power supply, the remote controller may control the duty ratio of the pulse width modulation signal based on the output voltage and the preset voltage threshold, and the boost circuit may convert the output voltage into the driving voltage supplied to the backlight light emitting element according to the pulse width modulation signal, that is, may convert the output voltage into the driving voltage based on the output voltage and the pulse width modulation signal corresponding to the output voltage, so that even when the output voltage changes, the boost circuit may convert the changed output voltage into the same driving voltage by adjusting the duty ratio of the pulse width modulation signal, that is, the remote controller may keep the driving voltage for the backlight light emitting element unchanged by controlling the duty ratio of the pulse width modulation signal, thereby maintaining the constant luminance of the backlight of the remote controller, and improving the user experience.
Optionally, in an embodiment of the present application, the obtaining the output voltage includes:
and acquiring the output voltage of the battery power supply at different moments.
The output voltage of the battery power supply at different moments is acquired, so that whether the output state of the output voltage is stable or not can be judged according to whether the output voltage is the same at different moments.
Optionally, in an embodiment of the present application, the preset voltage threshold includes a first preset threshold; the controlling the duty ratio of the pulse width modulation signal according to the output voltage and a preset voltage threshold comprises:
and under the condition that the difference value between the output voltage acquired at the current moment and the output voltage acquired at the previous moment is greater than or equal to the first preset threshold, adjusting the duty ratio of the pulse width modulation signal according to the output voltage acquired at the current moment, wherein the adjusted duty ratio of the pulse width modulation signal is used for enabling the driving voltage output by the booster circuit at the current moment to be the same as the driving voltage output at the previous moment.
By obtaining the difference between the output voltage at the current moment and the output voltage at the previous moment, the change degree of the output voltage at different moments can be clearly known, and then the duty ratio of the pulse width modulation signal can be controlled by determining that the change degree is beyond the expected degree, that is, the change of the output voltage with larger influence at different moments can be determined by determining that the difference is not less than a first preset threshold, so that the duty ratio of the pulse width modulation signal can be adaptively adjusted, and the driving voltage output by the boost circuit at the current moment is the same as the driving voltage output at the previous moment.
Optionally, in an embodiment of the present application, the preset voltage threshold includes a first preset threshold; the controlling the duty ratio of the pulse width modulation signal according to the output voltage and a preset voltage threshold comprises:
and maintaining the duty ratio of the pulse width modulation signal under the condition that the difference value between the output voltage acquired at the current moment and the output voltage acquired at the previous moment is smaller than the first preset threshold value.
By obtaining the difference between the output voltage at the current moment and the output voltage at the previous moment, the degree of change of the output voltage at different moments can be clearly known, and then the duty ratio of the pulse width modulation signal can be controlled by determining that the degree of change is within an expected degree, that is, by determining that the difference is smaller than a first preset threshold, the output voltage hardly changes at different moments or the influence caused by the change can be ignored, so that the duty ratio of the pulse width modulation signal can be maintained, and the driving voltage output by the booster circuit at any moment is the same.
Optionally, in an embodiment of the present application, the preset voltage threshold includes a second preset threshold, where the second preset threshold is a minimum output voltage value of the battery power supply for maintaining constant backlight brightness of the backlight light emitting element; the controlling the duty ratio of the pulse width modulation signal according to the output voltage and a preset voltage threshold comprises:
and when the output voltage is smaller than the second preset threshold, increasing the duty ratio of the pulse width modulation signal according to the second preset threshold.
Since the second preset threshold is the minimum output voltage value for maintaining the backlight brightness of the backlight light emitting element constant, it can be determined that the obtained output voltage cannot maintain the backlight brightness of the backlight light emitting element constant by determining that the output voltage is smaller than the second preset threshold, and thus the boost circuit can output the driving voltage for maintaining the backlight brightness of the backlight light emitting element constant by increasing the duty ratio of the pulse width modulation signal.
Optionally, in an embodiment of the present application, the preset voltage threshold further includes a third preset threshold, where the third preset threshold is a maximum output voltage value of the battery power supply for maintaining the backlight brightness of the backlight light-emitting element constant; the controlling the duty ratio of the pulse width modulation signal according to the output voltage and a preset voltage threshold further comprises:
and when the output voltage is greater than the third preset threshold, reducing the duty ratio of the pulse width modulation signal according to the third preset threshold.
Since the third preset threshold is the maximum output voltage value for maintaining the backlight brightness of the backlight light-emitting element constant, it can be determined that the acquired output voltage cannot maintain the backlight brightness of the backlight light-emitting element constant by determining that the output voltage is greater than the third preset threshold, and therefore the boost circuit can output the driving voltage for maintaining the backlight brightness of the backlight light-emitting element constant by reducing the duty ratio of the pulse width modulation signal.
Optionally, in an embodiment of the application, the controlling a duty ratio of the pulse width modulation signal according to the output voltage and a preset voltage threshold further includes:
and when the output voltage is greater than or equal to a second preset threshold and less than or equal to a third preset threshold, maintaining the duty ratio of the pulse width modulation signal.
Since the second preset threshold to the third preset threshold respectively correspond to the minimum output voltage value and the maximum output voltage value for maintaining the backlight brightness of the backlight light-emitting element constant, the threshold interval between the two preset thresholds can be determined to be the voltage value interval for maintaining the backlight brightness of the backlight light-emitting element constant, and therefore, by determining that the output voltage is greater than or equal to the second preset threshold and less than or equal to the third preset threshold, it can be determined that the obtained output voltage can maintain the backlight brightness of the backlight light-emitting element constant, and therefore, the duty ratio of the pulse width modulation signal can be maintained, so that the boost circuit can keep outputting the driving voltage for maintaining the backlight brightness of the backlight light-emitting element constant.
In a second aspect, an embodiment of the present invention further provides a remote controller, including: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the backlight brightness control method as described above when executing the computer program.
In the remote controller according to the embodiment of the present invention, the processor is capable of executing the computer program to implement the backlight brightness control method as described above, that is, when the output voltage of the battery power supply is acquired, the duty ratio of the pulse width modulation signal may be controlled based on the output voltage and the preset voltage threshold, and the boost circuit may convert the output voltage into the driving voltage supplied to the backlight light emitting element according to the pulse width modulation signal, that is, may convert the output voltage into the driving voltage based on the output voltage and the pulse width modulation signal corresponding to the output voltage, so that even when the output voltage varies, the boost circuit may convert the varying output voltage into the same driving voltage by adjusting the duty ratio of the pulse width modulation signal, that is, by controlling the duty ratio of the pulse width modulation signal, the driving voltage for the backlight light emitting element of the remote controller may be kept constant, thereby the user experience may be improved.
In a third aspect, an embodiment of the present invention further provides an air conditioning system, including an air conditioner and the remote controller described above, where the air conditioner is configured to receive a control signal sent by the remote controller and adjust an operation state according to the control signal.
The air conditioning system of the embodiment of the invention comprises a remote controller and an air conditioner for adjusting the running state according to a control signal from the remote controller, wherein the remote controller can execute a computer program through a processor to realize the backlight brightness control method, namely, under the condition of acquiring the output voltage of a battery power supply, the duty ratio of a pulse width modulation signal can be controlled based on the output voltage and a preset voltage threshold value, because a boosting circuit can convert the output voltage into a driving voltage for supplying to a backlight light-emitting element according to the pulse width modulation signal, namely, the output voltage can be converted into the driving voltage based on the output voltage and the pulse width modulation signal corresponding to the output voltage, even under the condition that the output voltage is changed, the boosting circuit can convert the changed output voltage into the same driving voltage through the duty ratio of the adjusted pulse width modulation signal, namely, the remote controller can enable the driving voltage for the light emitting of the backlight light-emitting element to be kept unchanged by controlling the duty ratio of the pulse width modulation signal, thereby the brightness of the backlight light can be kept constant, the user experience can be improved, the probability that the air conditioner can successfully receive the control signal of the remote controller can be more reliably adjusted according to the running state of the remote controller.
In a fourth aspect, the embodiment of the present invention further provides a computer-readable storage medium, which stores computer-executable instructions for executing the backlight brightness control method described above.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic diagram of an air conditioning platform provided by one embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a control circuit within the remote control provided in accordance with one embodiment of the present invention;
FIG. 3 is a schematic diagram of a PWM signal output by a control circuit in a remote controller according to an embodiment of the present invention;
FIG. 4 is a flowchart of a backlight brightness control method according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating a backlight brightness control method according to an embodiment of the present invention;
fig. 6 is a flowchart of obtaining an output voltage in a backlight brightness control method according to an embodiment of the present invention;
fig. 7 is a flowchart of controlling the duty ratio of the pwm signal in the backlight brightness control method according to an embodiment of the present invention;
fig. 8 is a flowchart of controlling a duty ratio of a pwm signal in a backlight luminance controlling method according to another embodiment of the present invention;
fig. 9 is a flowchart of controlling the duty ratio of the pwm signal in the backlight luminance controlling method according to another embodiment of the present invention;
fig. 10 is a flowchart of controlling the duty ratio of the pwm signal in the backlight luminance controlling method according to another embodiment of the present invention;
fig. 11 is a flowchart of controlling the duty ratio of the pwm signal in the backlight luminance controlling method according to another embodiment of the present invention;
FIG. 12 is a schematic diagram of a remote control provided in accordance with one embodiment of the present invention;
fig. 13 is a schematic diagram of an air conditioning system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
It is noted that while functional block divisions are provided in device diagrams and logical sequences are shown in flowcharts, in some cases, steps shown or described may be performed in sequences other than block divisions within devices or flowcharts. The terms first, second and the like in the description and in the claims, as well as in the drawings described above, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
The invention provides a backlight brightness control method, a remote controller, an air conditioning system and a computer readable storage medium, wherein when the remote controller acquires the output voltage of a battery power supply, the remote controller can control the duty ratio of a pulse width modulation signal based on the output voltage and a preset voltage threshold value, and a booster circuit can convert the output voltage into the driving voltage supplied to a backlight light-emitting element according to the pulse width modulation signal, namely, the output voltage and the pulse width modulation signal corresponding to the output voltage can convert the output voltage into the driving voltage, so that even when the output voltage changes, the booster circuit can convert the changed output voltage into the same driving voltage through the adjusted duty ratio of the pulse width modulation signal, namely, the remote controller can keep the driving voltage for the light emission of the backlight light-emitting element unchanged by controlling the duty ratio of the pulse width modulation signal, thereby maintaining the constant brightness of the backlight of the remote controller and improving the use experience of a user.
The embodiments of the present invention will be further explained with reference to the drawings.
Referring to fig. 1, fig. 1 is a schematic view of an air conditioning platform 100 according to an embodiment of the present invention, where the air conditioning platform 100 includes, but is not limited to, a remote controller 110.
It is understood that the remote controller 110 may include, but is not limited to, a battery power source, a voltage boosting circuit and a backlight light emitting element, and the battery power source, the voltage boosting circuit and the backlight light emitting element may be integrated in a control circuit inside the remote controller 110, wherein the battery power source is used for providing power support for each device inside the remote controller 110, the backlight light emitting element is used for providing backlight brightness to enable the remote controller 110 to be used in a dark condition, and the voltage boosting circuit is used for receiving a Pulse Width Modulation (PWM) signal and converting an output voltage of the battery power source into a driving voltage for the backlight light emitting element according to the PWM signal.
In another embodiment, the remote Controller 110 may further include, but is not limited to, a Micro Controller Unit (Micro Controller Unit) control circuit, the MCU control circuit may also be integrated in a control circuit inside the remote Controller 110, and the MCU control circuit is configured to output a PWM signal, as shown in fig. 3, fig. 3 is a schematic diagram of the PWM signal output by the control circuit inside the remote Controller according to an embodiment of the present invention, it can be seen that the MCU control circuit can periodically output the PWM signal, and the PWM signal has a high level and a low level to switch the voltage boosting circuit between a charging state and a discharging state under the switching of the high level and the low level, so as to implement voltage boosting; the MCU control circuit comprises a PWM control end for outputting a PWM signal, and the PWM control end is connected with the booster circuit so that the control end of the booster circuit receives the PWM signal and converts the output voltage of the battery power supply into the driving voltage supplied to the backlight light-emitting element according to the PWM signal.
It should be understood that, referring to fig. 2, fig. 2 is a schematic circuit diagram of a control circuit inside the remote controller 110 according to an embodiment of the present invention, wherein the voltage boost circuit 300 may include, but is not limited to, a first switch Q2 for controlling charging and discharging switching, one switch pin of the first switch Q2 is connected to the backlight emitting device D2, another switch pin of the first switch Q2 is connected to ground, and a control pin of the first switch Q2 is connected to the PWM control terminal to receive the PWM signal. The first switch tube Q2 is directly controlled by the PWM signal, the first switch tube Q2 is turned on when the PWM signal is at a high level state, and is turned off when the PWM signal is at a low level state, and the first switch tube Q2 is switched at a high frequency under the control of the PWM signal, so that the voltage boost circuit 300 is switched between a charging state and a discharging state, thereby realizing voltage boost.
It is understood that, referring to fig. 2, the voltage boost circuit 300 may further include, but is not limited to, a first inductor L1, a diode D1, and a first capacitor C1, one end of the first inductor L1 is used as an input end of the voltage boost circuit 300 to connect to the battery power supply VDD, the other end of the first inductor L1 is respectively connected to an anode of the diode D1 and one switch pin of the first switch tube Q2, a cathode of the diode D1 is connected to one end of the first capacitor C1 and is used as an output end of the voltage boost circuit 300, and the other end of the first capacitor C1 and the other switch pin of the first switch tube Q2 are both grounded.
The first switching transistor Q2 may be an NPN-type transistor or an N-type metal oxide semiconductor field effect transistor, and in this embodiment, the NPN-type transistor is taken as an illustrative example.
In this embodiment, when the PWM signal is at a high level, the first switch Q2 is turned on to form an inductor charging loop including the battery power VDD, the first inductor L1, and the first switch Q2, and the first inductor L1 stores energy; when the PWM signal is at a low level, the first switching tube Q2 is turned off, so as to form a capacitor charging loop of the battery power supply VDD, the first inductor L1, the diode D1, and the first capacitor C1, where the first inductor L1 discharges energy, and the first capacitor C1 serves as a filter capacitor and also stores energy.
Specifically, according to the volt-second principle, when the first switching tube Q2 is turned on, the energy stored in the first inductor L1 is Vdd × Ton, where Vdd is the output voltage of the battery power supply Vdd, and Ton is the on-time of the first switching tube Q2; when the first switch Q2 is turned off, the energy released by the first inductor L1 is Vdd-Vout Toff, where Vout is the output voltage of the voltage boosting circuit 300 (i.e., the driving voltage of the backlight emitting device D2), and Toff is the off-time of the first switch Q2.
According to the volt-second balance principle of the inductor, the energy stored in the first inductor L1 is equal to the released energy, and then:
Vdd*Ton＝Vdd-Vout*Toff；
ton = T × Duty, toff = T × 1-Duty, where T is the signal period of the PWM signal and Duty is the Duty cycle, so that there is:
Vdd*T*Duty＝Vdd-Vout*T*1-Duty；
after simplification, the following is obtained:
Vout＝Vdd/1-Duty；
because the output voltage of the voltage boost circuit 300 is related to the output voltage of the battery power supply VDD based on the duty ratio of the PWM signal, the output voltage of the voltage boost circuit 300 can be controlled by controlling the duty ratio of the PWM signal based on the MCU control circuit 400, so that the driving voltage for the backlight light emitting device D2 to emit light remains unchanged, thereby maintaining the constant brightness of the backlight light of the remote controller 110 and improving the user experience.
It is understood that, referring to fig. 2, the mcu control circuit 400 may further include, but is not limited to, a dc voltage input terminal, a PWM signal generation module for generating a PWM signal, and a duty ratio adjustment module for adjusting a duty ratio of the PWM signal, wherein the dc voltage input terminal is connected to the battery power supply VDD, an input terminal of the duty ratio adjustment module is connected to the dc voltage input terminal to obtain an output voltage of the battery power supply VDD, an output terminal of the duty ratio adjustment module is connected to the PWM signal generation module to output the duty ratio adjustment signal, and an output terminal of the PWM signal generation module is connected to the PWM control terminal to output the PWM signal for controlling the duty ratio to the PWM control terminal.
It can be understood that the duty ratio adjusting module obtains the output voltage of the battery power supply VDD through the dc voltage input terminal, generates a duty ratio adjusting signal according to the output voltage of the battery power supply VDD and the required driving voltage, and transmits the duty ratio adjusting signal to the PWM signal generating module, and the PWM signal generating module generates a PWM signal with a required duty ratio according to the duty ratio adjusting signal, so that the voltage boost circuit 300 outputs the required driving voltage.
It is understood that, in practical applications, for example, referring to fig. 2, the backlight emitting element D2 may be disposed in the backlight driving circuit 500, and the output end of the voltage boosting circuit 300 is connected to the backlight driving circuit 500, that is, the voltage boosting circuit 300 may provide a driving voltage for the corresponding backlight driving circuit 500, so that the backlight emitting element D2 can emit light under the condition that the backlight driving circuit 500 matches the driving voltage, specifically, the backlight driving circuit 500 includes a second switch Q1, a negative electrode of the backlight emitting element D2 is connected to one switch pin of the second switch Q1, another switch pin of the second switch Q1 is grounded, and a control pin of the second switch Q1 is connected to the PWM control terminal, so that the second switch Q1 is turned on when the PWM signal is in a high level state, and is turned off when the PWM signal is in a low level state, in another embodiment, the backlight driving circuit 500 further includes a first resistor R1 and a second resistor R2, the first resistor R1 is connected in series between the negative electrode of the backlight emitting element D2 and the one switch pin of the second switch Q1, and the second resistor R2 is connected in series between the PWM control terminal of the second switch Q1. When the second switch tube Q1 is switched on, the first resistor R1 is connected in series with the backlight light-emitting device D2, so that the current passing through the backlight light-emitting device D2 is limited, the backlight light-emitting device D2 is protected, and the current is prevented from being damaged due to overlarge current; the second resistor R2 is used as a current-limiting resistor of a control pin of the second switch tube Q1, protects the second switch tube Q1 and avoids burnout.
It can be understood that, since the backlight light emitting element may adopt a light emitting diode commonly known in the art, and a driving circuit adapted to the light emitting diode is also well known to those skilled in the art, those skilled in the art may set the backlight light emitting element and the corresponding driving circuit according to an actual application scenario, and details are not described herein for avoiding redundancy.
It should be noted that the specific structure and the operation principle of each device inside the remote controller 110 given in the above examples are only for convenience of explaining the operation principle of the remote controller 110, and the remote controller 110 is not limited to be used only based on the above structure, and on the premise that the remote controller 110 can be used based on the above operation principle, a person skilled in the art can set the specific structure of each device inside the remote controller 110 according to an actual application scenario, which is not limited.
The air conditioning platform 100 and the application scenario described in the above embodiments of the present invention are for more clearly illustrating the technical solutions of the embodiments of the present invention, and do not constitute a limitation to the technical solutions provided in the embodiments of the present invention, and it can be known by those skilled in the art that the technical solutions provided in the embodiments of the present invention are also applicable to similar technical problems along with the evolution of the air conditioning platform 100 and the appearance of new application scenarios.
It will be appreciated by those skilled in the art that the air conditioning platform 100 shown in the above examples is not intended to limit embodiments of the present invention, and may include more or fewer components than shown, or some components may be combined, or a different arrangement of components.
Based on the structure of the air conditioning platform 100 in the embodiment shown in fig. 1, various embodiments of the backlight brightness control method of the present invention are presented below.
As shown in fig. 4, fig. 4 is a flowchart of a backlight brightness control method according to an embodiment of the present invention, where the backlight brightness control method can be applied to a remote controller in an air-conditioning platform according to the embodiment shown in fig. 1, and the method includes, but is not limited to, steps S100 to S200.
Step S100, an output voltage of the battery power supply is acquired.
It can be understood that, the manner of obtaining the output voltage may not be limited, for example, referring to fig. 2, in the case that the remote controller includes an MCU control circuit, since a dc voltage input terminal in the MCU control circuit is connected to the battery power supply, the output voltage may be obtained through the dc voltage input terminal, or, a voltage detection element is used to directly obtain the output voltage, and the remote controller and the voltage detection element are connected, so that the remote controller obtains the output voltage through the voltage detection element, and the like.
Step S200, controlling a duty ratio of the PWM signal according to the output voltage of the battery power supply and a preset voltage threshold, so that the boost circuit converts the output voltage into a driving voltage for maintaining the backlight brightness of the backlight light emitting element constant according to the duty ratio of the PWM signal.
It can be understood that, when the remote controller acquires the output voltage of the battery power supply, the remote controller may control the duty ratio of the PWM signal based on the output voltage and the preset voltage threshold, and the boost circuit may convert the output voltage into the driving voltage supplied to the backlight light emitting element according to the PWM signal, that is, may convert the output voltage into the driving voltage based on the output voltage and the PWM signal corresponding to the output voltage, and therefore, even when the output voltage changes, the boost circuit may convert the changed output voltage into the same driving voltage by adjusting the duty ratio of the PWM signal, that is, the remote controller may keep the driving voltage for the backlight light emitting element to emit light unchanged by controlling the duty ratio of the PWM signal, thereby maintaining the luminance of the remote controller backlight constant and improving the user experience.
It can be understood that the timing for the remote controller to obtain the output voltage is not limited, and may be set according to the actual application scenario.
For example, when the remote controller sends a code, the remote controller does not yet fully operate, in other words, the remote controller is in a preset state, the output voltage is obtained and the duty ratio of the PWM signal is correspondingly controlled, so that the backlight light-emitting element can be normally turned on in the use state of the remote controller after the preset state, that is, the output voltage of the boost circuit is controlled by performing advance judgment, so that the backlight brightness of the backlight light-emitting element can be kept constant when the remote controller starts to be used, that is, the problem that the backlight brightness of the backlight light-emitting element is not constant when the remote controller starts to be used can be solved, so that a user is prevented from having a related problem in the process of using the remote controller, and the user experience is improved.
Examples are given below for explanation.
Example one
Referring to fig. 5, when the remote controller transmits a code, the MCU control circuit determines whether the output voltage of the battery power supply changes (or fluctuates), if so, it indicates that the output voltage is unstable, and in this case, the duty ratio of the PWM signal is increased or decreased accordingly, so as to finally maintain the backlight brightness of the backlight light-emitting device constant, otherwise, if it determines that the output voltage of the battery power supply does not change, it indicates that the output voltage is relatively stable, and in this case, the duty ratio of the PWM signal does not need to be adjusted, but only the duty ratio of the PWM signal needs to be maintained, so as to maintain the backlight brightness of the backlight light-emitting device constant.
It is understood that the remote controller may also continuously obtain the output voltage of the battery power supply for a period of time, that is, the remote controller obtains the output voltage of the battery power supply at each moment, so as to be able to know the output state of the output voltage in the period of time, so as to evaluate the actual condition of the output voltage according to the output state.
It is understood that a specific time for acquiring the output voltage of the battery power source may be preset, and the remote controller may acquire the output voltage at the set specific time, so that the output state of the output voltage at the specific time can be known, so as to evaluate the actual condition of the output voltage according to the output state.
It can be understood that, based on different application scenarios, the preset voltage threshold may take a corresponding value, so that the remote controller may more accurately and reliably control the duty ratio of the PWM signal according to the output voltage and the preset voltage threshold, and the following provides a corresponding example and an application scenario for description.
Referring to fig. 6, step S100 includes, but is not limited to, step S110.
In step S110, output voltages of the battery power supply at different times are obtained.
It can be understood that, by acquiring the output voltages of the battery power supply at different times, whether the output state of the output voltage is stable can be determined according to whether the output voltages are the same at different times, and since the output voltages are correspondingly converted into the driving voltages supplied to the backlight light-emitting elements, the light-emitting state of the remote controller backlight can be acquired in real time by acquiring the output voltages of the battery power supply at different times, so as to determine whether the light-emitting state of the remote controller backlight needs to be adjusted.
It can be understood that the remote controller may continuously obtain the output voltage of the battery power supply, and then obtain the output voltages at different times, or the remote controller may also obtain the output voltages at least some two different times, for example, obtain the output voltages at the previous time and the current time, or obtain the output voltages at the current time and the next time, and so on, which is not described in detail herein.
Referring to fig. 7, in case that the preset voltage threshold includes a first preset threshold, step S200 includes, but is not limited to, step S210.
And step S210, under the condition that the difference value between the output voltage of the battery power supply acquired at the current moment and the output voltage of the battery power supply acquired at the previous moment is greater than or equal to a first preset threshold value, adjusting the duty ratio of the PWM signal according to the output voltage acquired at the current moment, wherein the adjusted duty ratio of the PWM signal is used for enabling the driving voltage output by the booster circuit at the current moment to be the same as the driving voltage output at the previous moment.
It can be understood that, by obtaining the difference between the output voltage at the current time and the output voltage at the previous time, the degree of change of the output voltage at different times can be clearly known, and then the duty ratio of the PWM signal can be controlled by determining that the degree of change is outside the expected degree, that is, by determining that the difference is not less than the first preset threshold, the change of the output voltage with a large influence at different times can be determined, so that the duty ratio of the PWM signal can be adaptively adjusted, so that the driving voltage output by the voltage boost circuit at the current time is the same as the driving voltage output at the previous time.
It can be understood that the first preset threshold is used for measuring the magnitude of the variation degree of the output voltage at different times, and may be set by a person skilled in the art according to an actual application scenario and own experience, for example, for boost circuits with different structures, the person skilled in the art may set corresponding first preset thresholds for the boost circuits, so that the respective first preset thresholds can measure the magnitude of the variation degree of the voltage output by the corresponding boost circuit at different times.
Example two
The first preset threshold is set to 0.2V, the remote controller obtains the output voltage of 4.9V by using the duty ratio adjusting module at the current moment, and obtains the output voltage of 4.6V by using the duty ratio adjusting module at the previous moment, so that the difference between the output voltage at the current moment and the output voltage at the previous moment is 0.3, and in order to make the driving voltage output by the voltage boost circuit at the current moment be the same as the driving voltage output at the previous moment, according to the relational expression between the output voltage of the voltage boost circuit and the output voltage of the battery power supply shown in the foregoing embodiment, the remote controller can accurately adjust the duty ratio of the PWM signal to a corresponding value according to the output voltage of 4.9V at the current moment.
Referring to fig. 8, in case the preset voltage threshold includes the first preset threshold, step S200 includes, but is not limited to, step S220.
In step S220, the duty ratio of the PWM signal is maintained when the difference between the output voltage obtained at the current time and the output voltage obtained at the previous time is smaller than a first preset threshold.
It can be understood that, by obtaining the difference between the output voltage at the current time and the output voltage at the previous time, the degree of change of the output voltage at different times can be clearly known, and then the duty ratio of the PWM signal can be controlled by determining that the degree of change is within the expected degree, that is, by determining that the difference is smaller than the first preset threshold, it can be determined that the output voltage hardly changes at different times or the influence of the change is negligible, so that the duty ratio of the PWM signal can be maintained, and the driving voltage output by the boost circuit at any time is the same.
Example two
The first preset threshold is set to 0.2V, the remote controller obtains the output voltage of 4.9V by using the duty ratio adjusting module at the current moment, and obtains the output voltage of 4.8V by using the duty ratio adjusting module at the previous moment, so that the difference value between the output voltage at the current moment and the output voltage at the previous moment is 0.1, which indicates that the output voltage is expected, that is, the change of the output voltage to this extent can be accepted, so that the duty ratio of the PWM signal can be maintained, and the driving voltage output by the boost circuit at any moment is ensured to be the same.
Referring to fig. 9, in the case that the preset voltage threshold includes a second preset threshold, and the second preset threshold is a minimum output voltage value of the battery power source for maintaining the backlight brightness of the backlight light emitting element to be constant, step S200 includes, but is not limited to, step S230.
In step S230, when the output voltage is smaller than the second preset threshold, the duty ratio of the PWM signal is increased according to the second preset threshold.
It is to be understood that, since the second preset threshold is a minimum output voltage value at which the backlight luminance of the backlight light emitting elements is maintained constant, it may be determined that the acquired output voltage cannot maintain the backlight luminance of the backlight light emitting elements constant by determining that the output voltage is less than the second preset threshold, and thus the voltage boost circuit may be caused to output the driving voltage at which the backlight luminance of the backlight light emitting elements is maintained constant by increasing the duty ratio of the PWM signal.
Example three
The second preset threshold is set to 5V, and the remote controller obtains that the output voltage is 4.9V, that is, the output voltage is smaller than the second preset threshold, in this case, the driving voltage of the boost circuit corresponding to the second preset threshold is the minimum driving voltage for keeping the backlight brightness of the backlight light-emitting element constant, so that the duty ratio of the PWM signal can be increased according to the second preset threshold, and the boost circuit outputs the driving voltage for keeping the backlight brightness of the backlight light-emitting element constant.
Referring to fig. 10, in the case that the preset voltage threshold includes a third preset threshold, and the third preset threshold is a maximum output voltage value of the battery power source for maintaining the backlight brightness of the backlight light emitting element to be constant, step S200 further includes, but is not limited to, step S240.
In step S240, when the output voltage is greater than the third preset threshold, the duty ratio of the PWM signal is decreased according to the third preset threshold.
It is to be understood that, since the third preset threshold is the maximum output voltage value for maintaining the backlight brightness of the backlight light emitting element constant, it can be determined that the obtained output voltage cannot maintain the backlight brightness of the backlight light emitting element constant by determining that the output voltage is greater than the third preset threshold, and therefore the voltage boost circuit can output the driving voltage for maintaining the backlight brightness of the backlight light emitting element constant by reducing the duty ratio of the PWM signal.
Example four
The third preset threshold is set to 5.2V, and the remote controller obtains that the output voltage is 5.3V, that is, the output voltage is greater than the third preset threshold, in this case, the driving voltage of the boost circuit corresponding to the third preset threshold is the maximum driving voltage for keeping the backlight brightness of the backlight light-emitting element constant, so that the duty ratio of the PWM signal can be reduced according to the third preset threshold, and the boost circuit outputs the driving voltage for keeping the backlight brightness of the backlight light-emitting element constant.
Referring to fig. 11, step S200 further includes, but is not limited to, step S250.
In step S250, when the output voltage is greater than or equal to the second preset threshold and less than or equal to the third preset threshold, the duty ratio of the PWM signal is maintained.
It can be understood that, since the second to third preset thresholds respectively correspond to the minimum output voltage value and the maximum output voltage value for maintaining the backlight brightness of the backlight light emitting element constant, the threshold interval between the two preset thresholds can be determined as the voltage value interval for maintaining the backlight brightness of the backlight light emitting element constant, and therefore, by determining that the output voltage is greater than or equal to the second preset threshold and less than or equal to the third preset threshold, it can be determined that the obtained output voltage can maintain the backlight brightness of the backlight light emitting element constant, and therefore, the duty ratio of the PWM signal can be maintained, so that the voltage boost circuit can keep outputting the driving voltage for maintaining the backlight brightness of the backlight light emitting element constant.
Example five
The second preset threshold is set to be 5V, the third preset threshold is set to be 5.2V, and the remote controller obtains that the output voltage is 5.1V, that is, the output voltage is greater than the second preset threshold and smaller than the third preset threshold.
It is to be understood that, in a practical application scenario, a person skilled in the art may determine a threshold range for maintaining the backlight brightness of the backlight light emitting element constant, so that a person skilled in the art may determine a minimum output voltage value and a maximum output voltage value for maintaining the backlight brightness of the backlight light emitting element constant based on the threshold range, for example, for boost circuits with different structures, a person skilled in the art may set the corresponding minimum output voltage value and maximum output voltage value for each of them, which is not limited.
In addition, referring to fig. 12, an embodiment of the present invention further provides a remote controller 110, where the remote controller 110 includes: memory 111, processor 112, and computer programs stored on memory 111 and executable on processor 112.
The processor 112 and the memory 111 may be connected by a bus or other means.
Non-transitory software programs and instructions required to implement the backlight brightness control method of the above-described embodiments are stored in the memory 111, and when executed by the processor 112, perform the backlight brightness control method of the above-described embodiments, for example, performing the above-described method steps S100 to S200 in fig. 4, the method step S110 in fig. 6, the method step S210 in fig. 7, the method step S220 in fig. 8, the method step S230 in fig. 9, the method step S240 in fig. 10, or the method step S250 in fig. 11.
It is understood that the remote controller 110 can execute the computer program through the processor 112 to implement the backlight brightness control method as described above, that is, in the case of acquiring the output voltage of the battery power, the duty ratio of the PWM signal can be controlled based on the output voltage and the preset voltage threshold, and since the boost circuit can convert the output voltage into the driving voltage supplied to the backlight light emitting elements according to the PWM signal, that is, the output voltage can be converted into the driving voltage based on the output voltage and the PWM signal corresponding to the output voltage, even in the case of a change in the output voltage, the boost circuit can convert the changed output voltage into the same driving voltage through the adjusted duty ratio of the PWM signal, that is, by controlling the duty ratio of the PWM signal, the driving voltage for the backlight light emitting elements to emit light can be kept unchanged, thereby the brightness of the remote controller 110 can be maintained constant, and the user experience can be improved.
The above-described embodiments of the apparatus are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, i.e. may be located in one place, or may also be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, referring to fig. 13, an embodiment of the present invention further provides an air conditioning system 200, where the air conditioning system 200 may be applied to the air conditioning platform according to the embodiment shown in fig. 1, and the air conditioning system 200 includes, but is not limited to, an air conditioner 210 and a remote controller 110 in the air conditioning platform according to the embodiment shown in fig. 1, where the remote controller 110 is configured to send a control signal, and the air conditioner 210 is configured to receive the control signal sent by the remote controller 110 and adjust an operation state according to the control signal, that is, after a user controls the remote controller 110 to send the control signal, the air conditioner 210 may receive the control signal and adjust an operation state thereof based on the obtained control signal.
It can be understood that the type, model, etc. of the air conditioner 210 are not limited, and only the air conditioner 210 can be matched with the corresponding remote controller 110, that is, the air conditioner 210 can receive the control signal sent by the corresponding remote controller 110, therefore, those skilled in the art can set the corresponding air conditioner 210 and the corresponding remote controller 110 according to the actual application scenario, which is not limited.
Since the air conditioning system 200 in this embodiment and the remote controller 110 in the above embodiments belong to the same inventive concept, reference may be made to the specific embodiments of the remote controller 110 in the above embodiments for the specific embodiment of the air conditioning system 200 in this embodiment, wherein the remote controller 110 can execute a computer program through a processor to implement the backlight brightness control method as described above, that is, in the case where the remote controller 110 acquires the output voltage of the battery power, the remote controller 110 can control the duty ratio of the PWM signal based on the output voltage and a preset voltage threshold, since the boost circuit can convert the output voltage into the driving voltage supplied to the backlight light emitting element according to the PWM signal, that is, the output voltage and the PWM signal corresponding to the output voltage can convert the output voltage into the driving voltage based on the output voltage, even in the case where the output voltage varies, the boost circuit can convert the varying output voltage into the same driving voltage by the duty ratio of the PWM signal after adjustment, that the remote controller 110 can make the driving voltage of the backlight light emitting element maintain the brightness of the backlight light by controlling the duty ratio of the PWM signal, thereby maintaining the constant experience of the remote controller 110, not only improving the user experience of the use, but also improving the probability of the air conditioning system 200, and further facilitating the accurate acquisition of the remote controller 110.
Furthermore, an embodiment of the present invention also provides a computer-readable storage medium, which stores computer-executable instructions, which are executed by a processor 112 or a controller, for example, by a processor 112 in the above-mentioned apparatus embodiment, and can make the above-mentioned processor 112 execute the backlight brightness control method in the above-mentioned embodiment, for example, execute the above-mentioned method steps S100 to S200 in fig. 4, the method step S110 in fig. 6, the method step S210 in fig. 7, the method step S220 in fig. 8, the method step S230 in fig. 9, the method step S240 in fig. 10, or the method step S250 in fig. 11.
It will be understood by those of ordinary skill in the art that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, or suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are to be included within the scope of the present invention defined by the appended claims.

Claims (10)

1. The backlight brightness control method is characterized in that the method is applied to a remote controller in an air conditioning system, and the remote controller comprises a battery power supply, a booster circuit and a backlight light-emitting element; the boosting circuit is used for receiving a pulse width modulation signal and converting the output voltage of the battery power supply into a driving voltage supplied to the backlight light-emitting element according to the pulse width modulation signal;
the backlight brightness control method comprises the following steps:
acquiring the output voltage;
and controlling the duty ratio of the pulse width modulation signal according to the output voltage and a preset voltage threshold value, so that the boosting circuit converts the output voltage into a driving voltage which enables the backlight brightness of the backlight light-emitting element to be kept constant according to the duty ratio of the pulse width modulation signal.
2. The backlight brightness control method according to claim 1, wherein the obtaining the output voltage comprises:
and acquiring the output voltage of the battery power supply at different moments.
3. The backlight brightness control method according to claim 2, wherein the preset voltage threshold comprises a first preset threshold;
the controlling the duty ratio of the pulse width modulation signal according to the output voltage and a preset voltage threshold comprises:
and under the condition that the difference value between the output voltage acquired at the current moment and the output voltage acquired at the previous moment is greater than or equal to the first preset threshold, adjusting the duty ratio of the pulse width modulation signal according to the output voltage acquired at the current moment, wherein the adjusted duty ratio of the pulse width modulation signal is used for enabling the driving voltage output by the booster circuit at the current moment to be the same as the driving voltage output at the previous moment.
4. The backlight brightness control method according to claim 2, wherein the preset voltage threshold comprises a first preset threshold;
the controlling the duty ratio of the pulse width modulation signal according to the output voltage and a preset voltage threshold comprises:
and maintaining the duty ratio of the pulse width modulation signal under the condition that the difference value between the output voltage acquired at the current moment and the output voltage acquired at the previous moment is smaller than the first preset threshold value.
5. The backlight brightness control method according to claim 1, wherein the preset voltage threshold comprises a second preset threshold, and the second preset threshold is a minimum output voltage value of the battery power supply for maintaining constant backlight brightness of the backlight light emitting element;
the controlling the duty ratio of the pulse width modulation signal according to the output voltage and a preset voltage threshold comprises:
and when the output voltage is smaller than the second preset threshold, increasing the duty ratio of the pulse width modulation signal according to the second preset threshold.
6. The backlight brightness control method according to claim 5, wherein the preset voltage thresholds further comprise a third preset threshold, and the third preset threshold is a maximum output voltage value of the battery power supply for maintaining constant backlight brightness of the backlight light-emitting element;
the controlling the duty ratio of the pulse width modulation signal according to the output voltage and a preset voltage threshold further comprises:
and when the output voltage is greater than the third preset threshold, reducing the duty ratio of the pulse width modulation signal according to the third preset threshold.
7. The backlight brightness control method according to claim 6, wherein the controlling the duty ratio of the pulse width modulation signal according to the output voltage and a preset voltage threshold further comprises:
and when the output voltage is greater than or equal to a second preset threshold and less than or equal to a third preset threshold, maintaining the duty ratio of the pulse width modulation signal.
8. A remote control, comprising: memory, processor and computer program stored on the memory and executable on the processor, characterized in that the processor implements the backlight brightness control method according to any one of claims 1 to 7 when executing the computer program.
9. An air conditioning system, comprising an air conditioner and the remote controller of claim 8, wherein the air conditioner is configured to receive a control signal transmitted from the remote controller and adjust an operation state according to the control signal.
10. A computer-readable storage medium storing computer-executable instructions for performing the backlight brightness control method of any one of claims 1 to 7.
CN202110387782.9A 2021-04-12 2021-04-12 Backlight brightness control method, remote controller, air conditioning system and storage medium Pending CN115209584A (en)

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